Use this set to test the hardness of minerals for accurate identification under Mohs’ hardness scale ranging from 1 to 10. Kit includes four double-ended picks comprising eight points made of various metals and alloys with Mohs’ hardness values numbering 2, 3, 4, 5, 6, 7, 8, and 9. Points are large enough to be resharpened. Kit also includes a grinding stone for sharpening; a glass plate with a hardness of 5.5 which, when scratched, quickly determines a hardness range; a streak plate for testing a mineral’s streak color; a magnet for testing magnetic rocks such as magnetite and pyrrhotite; and complete instructions. All tools are packaged in an attractive, compact, mahogany-finished wooden case. 2-1/2” x 7” x 2”.